76 OTLi AND GAS; OHTO, WEST VIRGINIA, PENNSYLVANIA. 
found to be rather carbonaceous, carrying tiny partings of coal, 
with a total thickness of 3 or 4 inches. The limestone layer directly 
overlying this shale is cream white, but has a dark mottled appear¬ 
ance on fresh fracture. It appears locally as two ledges 1 to 2 feet 
thick, with a parting of calcareous shale. It is overlain by a layer 
of soft black shale from a few inches to a foot or more thick, which 
on weathering has a mealy, frosty-white appearance. Above this 
shale is a light-buff, thin-bedded, argillaceous limestone, from 1 to 3 
feet in thickness, which weathers to a bluish white. This layer is 
thickest in the vicinity of Washington, where it assumes a massive 
appearance, but is easily recognized by its tendency to break into 
thin sheets. In the vicinity of Good Intent this layer is very much 
darker and has the mottled appearance of the top layer, described 
below, resembling it closely both on fresh fracture and when exposed 
to the weather. Overlying this layer is from 1 inch to 3 feet of black 
shale, and this is in turn overlain by the top layer of the bed, which 
is from 6 inches to 2 feet thick, very hard and brittle, dark to black 
on fresh fracture, and cream to snowy white on weathering. 
Weathered portions of a ledge of this layer when broken present a 
peculiar brown-black mottled appearance, which, as already stated, is 
also characteristic of the third layer from the top. In fact, the three 
top layers of this bed form a group Avhose outcrop is always easily 
recognized. 
GREENE FORMATION. 
Only the lower portion of the Greene formation is present in the 
area studied, and that to a very small extent except in the Claysville 
quadrangle. Its greatest thickness of 475 feet occurs in Morris 
Township, on the dividing ridge between Washington and Greene 
counties. 
UPPER WASHINGTON COAL. 
Above the Upper Washington limestone, the top of which is the 
base of the Greene formation, the rocks are different in many adjoin¬ 
ing localities. Dark shale with a thickness of 3 to 15 feet is most 
common, though the same interval is in many places filled by 
argillaceous sandstone. Above this is the Upper Washington coal, 
consisting of 1 to 5 feet of black bituminous shale, in which are 
frequently found embedded thin layers of coal. The shale is uni¬ 
formly present, but the coal is variable, its maximum thickness 
being not more than 14 inches, including shale and clay partings. 
White® calls this the Jollytown coal, though Stevenson * 6 designates 
a coal farther down in the series by that name and calls this the 
“White, I. C., Geol. Survey West Virginia, vol. 2, 1903, p. 111. 
6 Stevenson, J. J., Second Geol. Survey Pennsylvania, Rept. K, 1876, p. 48. 
